The first dogs arriving in the Americas came from Siberia, and disappeared upon contact with European colonists
History of dogs in the Americas documented - life science news

Genetic studies on old dog skeletons have revealed that the first dogs to reach the Americas came from Siberia, together with ancient humans, over a land bridge that once connected Siberia with Alaska. These dogs were not domesticated American wolves, as has been thought before. They were already man’s best friends before coming to the Americas. This first lineage of dogs, however, disappeared upon contact with European settlers. Their only “living” legacy is a canine transmissible venereal tumor that can still be found in the European dogs that replaced them.

Read the full story: University of Illinois
Scientific publication: Science